XC2287 / XC2286 / XC2285
XC2000 Family Derivatives
Preliminary
Functional Description
1024 bytes (2 × 512 bytes) of the address space are reserved for the Special Function
Register areas (SFR space and ESFR space). SFRs are word wide registers which are
used for controlling and monitoring functions of the different on-chip units. Unused SFR
addresses are reserved for future members of the XC2000 Family. Therefore, they
should either not be accessed, or written with zeros, to ensure upward compatibility.
In order to meet the needs of designs where more memory is required than is provided
on chip, up to 12 Mbytes (approximately, see Table 3) of external RAM and/or ROM can
be connected to the microcontroller. The External Bus Interface also provides access to
external peripherals.
Up to 768 Kbytes of on-chip Flash memory store code, constant data, and control
data. The on-chip Flash memory consists of up to 3 modules with a maximum capacity
of 256 Kbytes each. Each module is organized in 4-Kbyte sectors. One 4-Kbyte sector
of Flash module 0 is used internally to store operation control parameters and protection
information.
Note: The actual size of the Flash memory depends on the chosen derivative (see
Table 1).
Each sector can be separately write protected1), erased and programmed (in blocks of
128 Bytes). The complete Flash area can be read-protected. A user-defined password
sequence temporarily unlocks protected areas. The Flash modules combine 128-bit
read accesses with protected and efficient writing algorithms for programming and
erasing. Dynamic error correction provides extremely high read data security for all read
accesses. Accesses to different Flash modules can be executed in parallel.
For timing characteristics, please refer to Section 4.4.2, for further Flash parameters,
please refer to Section 5.3.
1) To save control bits, sectors are clustered for protection purposes, they remain separate for
programming/erasing.
Data Sheet
37
V0.91, 2007-02
Draft Version
INFINEON [ Infineon ]
